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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40ee79e8de3a96d2112ca62a8db440371c5fc2ec1ccd68d505ee2dec4a8c2c1' 
  AND token = 'JsOXwwrnbJd4zGRrb77jCWOFn+DFBq0uvakZinPKb3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}